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STAAD Commands and Input Instructions
Section 5
5-62
NOTES:
1) DWW should never be less than DWW1. The user should
provide the member incidences accordingly.
2) The user is allowed the following options for the values AYF,
AZF and XIF.
a) If positive values are provided, they are used directly by
the program.
b) If zero is provided, the program calculates the properties
using the following formula.
AYF = D x TWW (where D =Depth at section under
consideration)
AZF = 0.66 ((BFF x TFF) + (BFF1 x TFF1))
XIF = 1/3 ((BFF x TFF
3
) + (DEE x TWW
3
) + (BFF1 x
TFF1
3
))
(where DEE = Depth of web of section)
c) If negative values are provided, they are applied as factors
on the corresponding value(s) calculated by the program
using the above formula. The factor applied is always the
absolute of the value provided, i.e. if the user provides the
value of XIF as -1.3, then the program will multiply the
value of XIF, calculated by the above formula, by a factor
of 1.3.
Prismatic
The property-spec for the PRISMATIC section-type is as follows -
1) AX = Cross-section area
2) IZ = Moment of inertia about the local z-axis
3) IY = Moment of inertia about the local y-axis
4) IX = Torsional constant
5) AY = Shear area for shear parallel to local y-axis.
6) AZ = Shear area for shear parallel to local z-axis.
7) YD = Depth of the section in the direction of the local y-axis.
8) ZD = Depth of the section in the direction of the local z-axis.